docs: def get_template_names(self):
          """Switch the templates for Ajax requests."""
          request = self.request
          key = 'querystring_key'
          querystring_key = request.GET.get(key,
              request.POST.get(key, PAGE_LABEL))
          if request.is_ajax() and querystring_key == self.key:
              return [self.page_template or self.get_page_template()]
          return super(
              AjaxMultipleObjectTemplateResponseMixin, self).get_template_names()